The reason for high heart rate without high blood pressure may be physiological factors, pathological factors, etc. 1. Physiological factors: for example, when the body is in a state of anxiety, nervousness, irritability, or when rest and sleep are not good, or when a large amount of strong tea, strong coffee, smoking and a large amount of alcohol, there may be a rapid heartbeat and blood pressure does not necessarily rise. 2. Pathological factors: cardiac diseases such as arrhythmia, coronary heart disease, unstable angina, myocarditis, pericarditis, tachycardia may also occur and blood pressure may not necessarily rise. Endocrine system disorders such as hyperthyroidism and hyperadrenocorticism may also be associated with tachycardia without elevated blood pressure. Shock caused by various factors may also be characterized by rapid heart rate, rapid pulse, and decreased blood pressure. The above conditions should be taken seriously and the patient should be hospitalized.